string = "你好,请问我可以帮助你什么abc  ?  "
print(string)
while True:
    choose = str(input("1.删除空格 2.英文标点替换 3.英文单词大写 4.英文单词小写 5.退出\n"))
    if choose == '1':
        string = string.replace(" ", "")
        print(string)
    elif choose == '2':
        for i in string:
            if i == ',':
                string = string.replace(",", "，")
            elif i == '.':
                string = string.replace(".", "。")
            elif i == '?':
                string = string.replace("?", "？")
            elif i == ';':
                string = string.replace(";", "；")
        print(string)
    elif choose == '3':
        string = string.upper()
        print(string)
    elif choose == '4':
        string = string.lower()
        print(string)
    elif choose == '5':
        print("已成功退出,感谢您使用。")
        break